Wastegate Outlet Muffler
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Although it is not that loud and only at WOT full boost and at that point I am not worried about it. lol
But if the muffler kit gets people to go with wg dump, then that is cool.
Here is mine with windows open:
http://www.youtube.com/watch?v=TRTGqxiUeac
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Although it is not that loud and only at WOT full boost and at that point I am not worried about it. lol
But if the muffler kit gets people to go with wg dump, then that is cool.
Here is mine with windows open:
http://www.youtube.com/watch?v=TRTGqxiUeac
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
Although it is not that loud and only at WOT full boost and at that point I am not worried about it. lol
But if the muffler kit gets people to go with wg dump, then that is cool.
Here is mine with windows open:
http://www.youtube.com/watch?v=TRTGqxiUeac
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I'm somewhat familiar with the concept after having an O2 dump on a 1g DSM - it did help with the mid-top end performance.
I'd love to find out how this setup helps a 951.
I'd love to find out how this setup helps a 951.
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I have been contemplating dumping the wastegate for the last couple of months, this might just convince me to do it. I do want to know difference in numbers, as well as sound difference.
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Therefore, get rid of the wastegate flow and you'll have less back pressure on the engine.
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Mike, do you have any audio clips or videos comparing this?
I'm not sure how effective what looks to be a maybe 6-8" long straight-thru glasspack style muffler is going to be at giving a significant dBA reduction over a straight dump.
I like the idea, but it would be nice to know how effective it really is. I would be interested if it really works.
I'm not sure how effective what looks to be a maybe 6-8" long straight-thru glasspack style muffler is going to be at giving a significant dBA reduction over a straight dump.
I like the idea, but it would be nice to know how effective it really is. I would be interested if it really works.
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Mike, do you have any audio clips or videos comparing this?
I'm not sure how effective what looks to be a maybe 6-8" long straight-thru glasspack style muffler is going to be at giving a significant dBA reduction over a straight dump.
I like the idea, but it would be nice to know how effective it really is. I would be interested if it really works.
I'm not sure how effective what looks to be a maybe 6-8" long straight-thru glasspack style muffler is going to be at giving a significant dBA reduction over a straight dump.
I like the idea, but it would be nice to know how effective it really is. I would be interested if it really works.
It's quieter then just dumping open, but not as quite as tying back in. Think in the middle. It would be a similar change in dB that you would get runing a exhaust with and without a muffler. It is a blow through. If you did chambered to be even quieter, then you destroying the preformance you're trying to gain. If you want totally quiet, try ear plugs.
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We can do a 18" version versus this 12" but it will require a bracket be welded on the main exhaust pipe for support. This version attaches to stock exhaust hanger mount for support. If someone thinks they would want a 18" version, we will go ahead and build some (take 2-3 days), and put on the web site.
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Mike or Dave Lindsey
www.lindseyracing.com
U.S. 1-877-943-3565
Other 1-405-947-0137
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Mike: Do you have any data on quicker spool up or over all gains from the dump?
Like TurboTommy said this obvioulsy reduces back pressure which we know is always a good thing, but just curious how much performance is actually gained.
Like TurboTommy said this obvioulsy reduces back pressure which we know is always a good thing, but just curious how much performance is actually gained.
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Let's try this from a common sense approach.
We don't know exactly how much of your exhaust (percentage wise) is flowing though the
wastegate versus the primary tube. 10, 15, 20% maybe more? We believe most cars when at WOT (and under boost), your wastegate is probably wide open. If you're running a dump to atmosphere set-up now, you can simply verify that with your own ears. There is no questions that it's open and seems to be the case on any level of build so far we have listened to. We find typically if using a DP WG, that your WG is starting to open once you reach 1/2 the total boost setting with the throttle WOT.
So based on that knowledge, if you're tied back in, you're adding that percentage of exhaust back into
your primary tube. That means you're putting more through the same pipe which is going to increase the
back pressure. So dumping to atmosphere has the same net effect as putting a larger primary tube exhaust system on the car without actually putting a larger primary tube exhaust system on the car.
So a stock exhaust may act like a 3", and a 3" may act like a 3.5", and a 4" might act like a 4.5" etc...
Even a 5" exhaust is going to have back pressure. The more HP (air to move), the more back pressure. And if you dump to atmosphere on the WG with whatever size you have, you improve the flow and reduce back pressure even more.
This product is all about doing something with the sound you get when you do dump to atmosphere which some might not find to their liking.
We don't know exactly how much of your exhaust (percentage wise) is flowing though the
wastegate versus the primary tube. 10, 15, 20% maybe more? We believe most cars when at WOT (and under boost), your wastegate is probably wide open. If you're running a dump to atmosphere set-up now, you can simply verify that with your own ears. There is no questions that it's open and seems to be the case on any level of build so far we have listened to. We find typically if using a DP WG, that your WG is starting to open once you reach 1/2 the total boost setting with the throttle WOT.
So based on that knowledge, if you're tied back in, you're adding that percentage of exhaust back into
your primary tube. That means you're putting more through the same pipe which is going to increase the
back pressure. So dumping to atmosphere has the same net effect as putting a larger primary tube exhaust system on the car without actually putting a larger primary tube exhaust system on the car.
So a stock exhaust may act like a 3", and a 3" may act like a 3.5", and a 4" might act like a 4.5" etc...
Even a 5" exhaust is going to have back pressure. The more HP (air to move), the more back pressure. And if you dump to atmosphere on the WG with whatever size you have, you improve the flow and reduce back pressure even more.
This product is all about doing something with the sound you get when you do dump to atmosphere which some might not find to their liking.
Last edited by Mike Lindsey; 12-02-2010 at 04:00 PM.
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Do you get much in the way of residual exhaust fumes in the car from having it exit directly under the car? Just curious.